Abstract: There are few researches on the remanufacturing of permanent magnet synchronous motor cores, and it is difficult to improve its performance. It is of great significance to find a feasible method for improving the performance of cores. The hybrid laminated stator is manufactured by silicon steel of old motors and amorphous alloy. The performances of the motor before and after remanufacturing are analyzed, and the method of optimizing the torque is proposed. After hybrid lamination remanufacturing, the loss and efficiency of the motor are greatly reduced, but the torque of the remanufactured motor is reduced. As the increase of stator tooth width, winding turns and current, the torque is gradually increased. By means of parametric scanning and orthogonal analysis, a comprehensive optimization analysis of the torque and loss of remanufactured motor based on the change of stator slot size and current is carried out. Further more, the optimum scheme of remanufactured motor torque is established, which reduces the width of stator teeth by 0.8 mm, increases slot height by 1.2 mm and reduces rated current by 1.7 A. The bench test of motor shows that compared with the original motor, the torque of remanufactured motor after optimization is basically unchanged but the efficiency is improved, which verifies the validity of the optimum scheme and simulation results. The research of hybrid laminated stator provides a new idea for motor remanufacturing and the performance improvement of motor cores.

Key words: remancfacture, hybird laminated, torque optimization, permanent magnet synchronous motor.